Had the bike a week now and ride to and from work each day since 10 miles a day. So far, thoroughly enjoying it. The only recurring problem is the chain coming off - sometimes twice in 1 journey! I'm guessing the chain needs a link or more removed - is there some way to check how long the chain should be?

 

I know using an electric assist bike is 'cheating' but, after a week I'm looking forward to the next ride rather than it being a chore and giving up.

 

I've been using a utility on my Android fone to track my progress - so far, my heart rate has peaked at 149 with an average of 137 - probably a little more than when I sit in my car

 

I know using an electric assist bike is 'cheating'

No it's not, no more than using a car or even shoes!

Just enjoy.

Chain coming off sounds more like an adjustment is needed to the derailleur end stops than chain shortening, there's lots of videos worth a look on the tube to show how if you haven't done it before.

Dave.

One thing to check first. Grab hold of either crank arm and yank it from side to side (axial direction). If you can feel any play, like knocking rocking, clunking, etc, your bottom bracket needs attention.

 

If thats OK, have a look at the very back of the rear derailleur near the axle. You'll see a single screw. Give it a few turns clockwise to increase the tension on the chain.